Chapter Text
Aizawa genuinely thought he would go crazy before the end of the semester. He had been teaching at the university for a few years. Young people, inspired students, but also full of hormones and ambitions, sometimes misdirected. But that semester was the first time he truly felt tempted. Temptation in its purest form.
The first days of class had gone unnoticed. He taught that group twice a week, and normally he didn’t pay much attention to who his students were unless someone stood out in a positive or negative academic way. He didn’t really care about their faces, appearances, genders, or secondary genders. Over the months of classes, the blur of students would turn into actual faces. This time, before the first month was even over, one face had already stood out.
At first, it was just a face—a boy with messy, curly green hair, bright green eyes full of hope—he even had a freshman’s aura, even though that course wasn’t for first years—and freckles that constellated his entire face. What had stood out about him were his quick, correct, and precise answers in class, and the way he sometimes could be seen murmuring quietly to himself during lectures.
Being impressed by a student’s intelligence, even early in the semester, still happens sometimes. What really unsettled him, though, was when, by a twist of fate, the boy—who he learned was young Midoriya Izuku—started arriving just a little after Aizawa to the classroom. That led the professor to notice him not just for his brain.
Izuku’s face alone was striking—the smile, the way he spoke, and those freckles—but his body was an entirely different conversation. Simply impressive. He was shorter than most of his classmates—which made Aizawa suspect he might be an omega, though that was only a guess at that point. His chest seemed strong by the way it outlined his clothes, though it was always hidden under looser shirts—once again making him imagine an omega, perhaps hiding his figure. His waist, on the other hand, was slim, complementing his wider hips, his round, firm ass, leading to equally full thighs and killer legs.
If one of his colleagues had confessed to admiring a student’s body like that, Aizawa would have immediately reprimanded them. Even though all the students were adults, they were still university students. Professors held authority, and therefore it was their responsibility to protect the young. However, his moral stance crumbled the moment Izuku walked into class in tight jeans.
Once he noticed that ass and those legs, the itch inside him only grew. Sometimes during his lectures, his gaze would get lost staring at the boy, forcing himself to remember how obvious it would look if he wasn’t careful. “It’s just physical attraction, I just need to survive until the end of the semester.” He told himself.
The most logical thing to do was just survive, treat him like any other student until the semester ended. That was it. That was all he needed to do—even if, alone at night, he imagined what that body would look like naked, and what it would feel like to bite into those thighs. It’s just fantasy. Just fantasy. He repeated it to himself like a mantra.
By the second month of teaching that class, he could almost feel his sanity hanging by a thread. It was a day of in-class activities, an exercise list meant to clear up doubts before the first test. The very first thing he noticed when Izuku arrived, for the first time, was the scent — Omega, without a doubt. His legs trembled as the boy walked in. It was the smell of herbs, mint, and spices, a fragrance that reminded him of warmth and comfort.
The fact that he could smell it meant either the scent patch wasn’t working properly or Izuku had forgotten to put it on that morning. And God, how he wished that had happened earlier—while at the same time wishing he hadn’t smelled it at all. He immediately averted his gaze when Izuku’s green eyes turned toward him. His hand went to his own scent patch to make sure it was there and working. He couldn’t let his own alpha scent escape.
It wasn’t a university rule for omegas or alphas to use scent patches; it was even considered healthy to have an environment where relationships were maintained even with scents freely present. But he had gotten into the habit of wearing one after his mouth watered the moment, he had first smelled Izuku. Normally, his own scent didn’t get out of control, but it was dangerous if he had to face the young man without any precontions.
The scent wasn’t what drove him mad—if only it were that simple. The class was working on the exercise list, some alone, others in pairs or groups. Izuku was paired with Todoroki. It was common to see the two together around campus, and of the people in that classroom, Todoroki was probably the one closest to the omega. It wasn’t surprising when they asked the professor to come over and clear up a doubt. Both were too engaged in class to let any question slide.
Aizawa approached them just like he had with everyone else, forcing his eyes to settle on Todoroki, avoiding Izuku with all his strength, trying not to notice the tight pants or the loose long-sleeved green shirt, seemingly made of heavier fabric, though with a slightly loose V-neck collar.
“Sensei, we’re have a question about this exercise,” Izuku said, his voice sounding smoother, more velvety than usual.
“What question?”
“Well, we were thinking about using the formula you showed us last time, but after looking at the question, we’re not sure if it makes sense.”
Aizawa started explaining what needed to be done, while both students listened and answered his questions. This was followed by a short discussion about the formulas, how to apply them, and which method would be fastest to reach the answer—and whether the professor expected a specific kind of solution on the test. In all the movement of answers and questions, several pens fell off the desk. The omega bent down to pick them up, and in that motion, the green shirt shifted forward, and the collar tilted just enough for Aizawa to catch the briefest glimpse—a moment that to him felt both too fast and too slow.
In that fleeting glimpse, the shirt tugged forward, and through the slight neckline, he could see just for an instant the light, plain, discreet fabric braw Izuku wore. It was common for omegas to use them—even male omegas—since depending on how close they were to their heat; nipples could become more sensitive. They were made specifically to prevent discomfort. It was a glimpse of paradise. Too quick, because he wanted to see more, wanted to indulge longer in the temptation, and too long, because he couldn’t tear his gaze away.
If Izuku noticed Aizawa’s stare, he didn’t show it, quickly straightening himself after putting the pens back into the case.
“If you have any more questions, you can ask, but I don’t think either of you will have trouble with the test,” the professor replied quickly, turning to check on the rest of the students in the room. But he still caught, barely, the low voice of the omega whispering to his friend.
“I get the impression Sensei doesn’t like me.”
He stopped himself from saying anything—it wasn’t meant to be heard, he had only caught it because he was still trying to pay attention to the omega. Omega’s about to go into heat and he thinks we hate him. His alpha hissed inside his head, dripping with venom. He shoved all his instincts as far down as he could and returned to his tasks.
Still, he could feel his sanity cracking. His mouth filled with water and poison—he wanted that omega. He didn’t know anything about him yet, but he knew he could go insane if he couldn’t at least get a little closer. He needed more, or at least to test if approaching was even possible.
He wanted to know if, should he approach, he would be immediately rejected or not. He wanted to test it, just a small test, one that wouldn’t get him instantly fired for misconduct. After the first round of exams for his class, Aizawa graded them faster than he ever had before. It was one of the rare times they were all corrected by the very next class. But he pretended to make a mistake.
The university had an online system where professors posted grades and later returned the students’ exams. Midoriya and Todoroki had both scored excellent marks, close to each other. (Aizawa had made a point of grading without looking at the names at the top of the papers, only checking them when entering the grades in the system.) And deliberately, he entered Izuku’s grade almost five points lower. There’s no way he won’t come after me when he sees this.
And he was right. The grades had been posted the night before, and the classroom was buzzing—some students excited about their scores, others looking defeated. Izuku was in the second group, looking confused and anxious. Aizawa felt guilty for putting the boy in that state on purpose, but he needed to get closer, and this was the only plan he had managed to set in motion.
“Sit down, I’ll hand back the exams and then correct them on the board. Any questions or issues with the exam, come to my office after class,” he instructed, starting to hand each exam back personally. Without taking his eyes off Izuku, when he finally handed him his paper, the boy’s green eyes widened and sparkled.
“Aizawa-sensei…” Izuku began. “My grade in the system…”
“After class, in my office, Midoriya.”
Aizawa pulled away quickly; he didn’t want to resolve this in the classroom. He wouldn’t be unfair—of course he would fix the grade no matter what. This was only to test the waters, nothing more. He heard the omega whisper something to Todoroki, who replied in an equally low voice, making the green-haired boy blush. What just happened? He couldn’t catch the omega’s scent at that moment; he would have given an arm to know exactly what the student was thinking.
He forced himself to look away from the omega while finishing his explanation of the most common mistakes on the test, but he could still feel the intensity of those green eyes. Is it just annoyance about the grade? Maybe he just thinks I’m a dumb professor.
At the end of class, the professor easily slipped past young Midoriya—he was the only one who had something to say about the exam—and managed to reach his office without anyone stopping him. He wasn’t going to do anything too risky, only wanted to see how the student would react, deciding that if it was even slightly negative, he would give up on everything else. Deep down, he still thought what he was doing was illogical, but it was like an itch under his skin, his alpha needed this.
After making sure nothing important was lying around, he removed his scent patch and tossed it into the trash bin hidden behind his desk. The office already carried his scent—it wasn’t as strong as his den, obviously—but still strong enough to be noticeable. He sat down at his desk as casually as he could, which wasn’t much—he was nervous.
A pounding sensation pressed in his chest and at the base of his throat. An expectation he couldn’t put into words—the urge to be close, to feel the other, to want an omega. Deaf to the sound of his own heartbeat, he heard a knock at his door.
“Aizawa-sensei, may I come in?” The voice sounded a little unsteady.
“Come in, Midoriya.”
When the door opened, the boy looked uncertain, holding the exam in his hand. The omega hesitated a few moments before entering, then was immediately enveloped by the professor’s scent. A strong aroma of coffee and cardamom—it was possible to see his nose twitch slightly and his shoulders relax. The omega eased—a good sign. He likes it, Aizawa’s alpha whispered.
“Sensei, the grade in the system is different from the one on the exam. It’s showing a lower score.”
“Sit down, Midoriya. I’ll check it, and if it’s wrong, I’ll fix it now.” He gestured to the chair in front of the desk, and the omega sat without another word. The boy leaned forward, extending the exam in his hands.
Aizawa seized the moment—one of those instances he had been waiting for. As he reached out, his fingers brushed the back of Izuku’s hand, carefully letting them linger before taking the paper from him.
The pheromones were immediate. Just a small touch was enough for Izuku’s scent to spill out—sweet, delicious, laced with mint freshness. The alpha felt venom bead in his mouth and swallowed it quickly. He pretended to study the exam in his hand, going over each question slowly—though he had already memorized it. He knew the only mistake was in the system.
“I guess it was just a typing error.” Izuku’s voice was now steadier, calmer.
“Looks like it. You almost got everything right. What happened with this one?” It was a slight shift in topic, as he set the paper on the desk and pointed to the question in question.
“This one?” The omega leaned further forward—more than necessary to see what was written. His neck tilted to the side, giving a perfect view of his smooth skin—though unfortunately, his gland was hidden beneath the shirt. This time, Aizawa’s pheromones slipped out unconsciously, heavy and intense, venom filling his mouth again.
“I got distracted and ended up using the wrong formula.”
“Sensei?” Izuku called when he didn’t answer, pulling the alpha back to reality.
“Just be careful. You have too much potential to lose points to distraction.”
“If I may say, you seem distracted yourself.” The omega’s voice was even more velvety than usual, tilting his neck again, stretching it out. “Is everything alright?”
“Don’t worry about me. Let me fix your grade in the system right away.” The mixture of their pheromones was strong now, and Aizawa could smell Izuku even more clearly. The omega smells like slick. The omega likes us. GET CLOSER TO THE OMEGA. He tried to refocus on the computer to alter the grade, but he already had the evidence he wanted—that he could move closer. “Done.”
The dark-haired alpha stood and leaned closer over the omega. “See if you received the notification of the change.” He placed a hand on Izuku’s shoulder, squeezing lightly. Watching carefully for any reaction, when Izuku placed his own hand over his, Aizawa smiled. His plan was to dismiss the student right after. The idea had never been to do anything reckless that could cost him his job. But he didn’t even have time to think.
The scent of the room shifted in an instant—Aizawa’s pheromones were gone, erased, as if the office had never been his. The entire space was flooded with the omega’s scent, nearly suffocating. It left him dizzy—too strong, too enticing—his fangs ached, his head cried: Omega. Omega.
It couldn’t have been more than a few seconds that Izuku’s scent flared, yet when Aizawa realized it, the omega had already pulled him and, in a swift motion—too fast for the alpha to catch—pinned him against the wall of his office.
The green-haired man, shorter though he was, gripped Aizawa’s shirt tightly, forcing him against the cold wall. The scent grew stronger.
Slick, slick. I want it. Aizawa couldn’t tell if the words were coming from his own mouth or from his alpha, from his deepest instinct. His legs felt like jelly. He caught the victorious look, the mischievous smile on Izuku’s face as the omega released him, letting him slide down the wall until he sat on the floor.
“Sensei… already given up?” There was a small laugh hidden in the words. Izuku followed him down, kneeling at his side. Aizawa’s head was spinning, a ringing in his ears making it hard to even hear what the omega said. The alpha bared his fangs, growling low, a last attempt at being even minimally threatening.
“Sensei, you can’t bare your fangs at a student.”
Izuku leaned closer, face near his, close enough for their breaths to mingle. Even though Aizawa’s legs wouldn’t respond, his arms moved on their own. His hands touched his student’s curly hair, trying to draw his head closer. He wanted to press their faces together, wanted their lips to meet. The omega allowed his hands to stay, but his face didn’t move any closer.
Danger.
He had no control over himself, the buzzing grew louder in his ear, and he had discovered that his hands didn’t seem strong enough even to pull a face closer to his. A defenseless alpha.
The sense of danger grew even stronger when he saw the omega’s fangs bared. An omega’s fangs, even though smaller than an alpha’s, were just as strong—perhaps even stronger. They were made to pierce deep, a weapon of protection for an omega. The scent of pheromones grew even heavier, but now, beyond the sweetness of slick, the sensation of a pre-heat, it carried a sharper, more threatening edge.
“Are you trembling? Was this how you thought you’d see me after calling me into your office? Sensei?” The mocking tone was clear, though the words barely registered in the alpha’s mind. “Poor thing, this must be uncomfortable.” Izuku’s soft hands moved to Aizawa’s crotch. He himself hadn’t realized it, but he was hard, painfully so. The touch drew a moan from him—pleasure mixed with pain. Whatever strength he had left drained away, leaving him at the mercy of his student.
“What do you want?” the omega asked slowly, with authority, watching the professor writhe. “I could just leave if you’d like.”
“Touch me… omega… please…” The alpha’s voice came out broken, trapped between pain and desire. It seemed his brain couldn’t form even the simplest thoughts.
In one precise motion, Izuku unzipped the alpha’s pants. First, he touched him through his underwear, drawing more moans, but didn’t linger. With a few skillful moves, he freed the member, licking his lips before straddling the alpha, one leg on either side, sitting down on him. He began stroking the entire length, pumping him firmly, massaging, circling his fingers over the head, pulling raw sounds of pleasure from Aizawa.
“I bet this could give me a lot of pleasure if you were still thinking straight, Sensei…”
The words seemed to jolt the professor back to a sliver of sanity—or at least allowed his alpha instincts of domination to flare. His hands shot to the omega’s ass, gripping hard enough to make Izuku lose composure for a moment. One hand stayed there while the other fumbled for the zipper of the omega’s pants.
“Omega,” he growled, almost a snarl. The alpha’s pheromones finally began to spread, faint but present, lighting Izuku’s hold on the air.
“Nah, no.” The green-haired boy shook his head. “You’ll end up going feral like this.” His voice still amused, he squeezed the alpha’s cock harder, drawing a louder cry. Izuku bared his fangs this time with clarity. “BAD ALPHA.”
Aizawa came instantly at the words, as if they were a command, instinctively submitting to the omega in his stupor. This time, it was Aizawa who tilted his neck, fully exposing it. Izuku chuckled softly and scraped his fangs lightly against the bare skin.
Then Izuku stood, leaving behind a damp scent of slick clinging to his professor’s thighs. But slowly the heaviness of pheromones in the office began to fade. Without taking his eyes off the alpha still on the floor, he pulled a pack of tissues from his backpack, knelt again, and cleaned up the mess he had made. He then retrieved a bottle of medicine, swallowed a capsule, replaced the scent patch on his neck with a fresh one, and waited a few minutes for the alpha to recover.
When Shouta finally regained some clarity, he rose slowly, a pounding headache still present. He had never been exposed to such a pheromone blast. In fact, he hadn’t even known it was possible.
“What the hell was that?” His voice came out harsh, throat raw, his whole-body aching.
“You’re the one who brought an omega into your office under false pretenses. Did you think I wouldn’t notice the amount of pheromones you released? Your discarded scent patch?”
The alpha was left speechless at the accusation, opening and closing his mouth a few times before managing words. He had indeed set a trap, but never to force anything on the omega—absolutely not.
“What do you want?” he asked finally, cutting to the point.
“Nothing. Wasn’t this what you wanted? To be touched?”
“That’s not exactly what I had in mind. I wasn’t going to do anything.” His voice wavered, uncertain of its own truth.
“Not now, you mean. Every alpha says that—‘I wasn’t going to do anything, it was just courtship’—but the second they smell pheromones, they think they can have it.” Izuku slung his backpack over his shoulders and walked to the door. “Alphas are all despicable.”
And he left. No further explanation, no concern for consequences, no thought that he had just sexually attacked his professor.
Aizawa sat there in shock, waiting for his soul to fully return to his body, the lingering mix of pheromones still hanging in the office air. He slumped back into his chair and realized:
1 – He had seriously screwed up by letting himself get close to a student.
2 – He needed to know more about that omega.
3 – He wanted to be that omega’s alpha. HIS.